AV1 is already faster and has been for around three years — if you're not using the reference encoder, which is dog slow, and that will probably not change. Have a gander at SVT-AV1.

SVT-AV1 can achieve better quality for the same encode time as x265 at every point of the encoding curve. Alternatively SVT-AV1 can achieve the same quality for better encoding time:

https://engineering.fb.com/2023/02/21/video-engineering/av1-...

HEVC is from the VP9 generation of codecs. AV1 is 30% more efficient for HD encodes, and the gap increases for higher resolutions and color depths.